Free. Browser-based. No signup.
Nelstack.com
Simple tools for everyday work. Calculators, bills, stamps and signatures that stay out of your way.
Start here
What do you want to do?
Pick a task — then open the tool. No need to learn our product map first.
- Calculate somethingEMI, SIP, FD, tax, GST and metal ratesContinue
- Create a bill or receiptGST invoices, rent receipts and Indian formatsContinue
- Sign a documentDraw, type, or sign a PDF onlineContinue
- Create a stampCompany seals, templates and stamp a PDFContinue
- Speed up bookmarksWhistle Chrome extension — aliases, fuzzy search and hotkeysContinue
- Check gold ratesToday’s indicative India gold priceContinue
Explore products
Five product suites
Navigation is organised by product. Start from a task above, or open a suite directly.
Financial Calculators
57+ calculators · live metal rates
Metal rates, income tax planner, FD, EMI, SIP and more financial tools
Open Financial CalculatorsPopular
Bill Generator
52 Indian formats · live PDF preview
Indian bill & receipt formats with live preview and PDF
Open Bill GeneratorOnline Signature
Draw or type · transparent PNG
Draw or type a free signature PNG — private, no signup
Open Online SignatureStamp Maker
Seals · circular text · PNG & SVG
Free online stamp & seal maker — PNG, SVG, stamp a PDF
Open Stamp MakerWhistle
Chrome Extension · keyboard launcher
Chrome extension — aliases, fuzzy search, pinned hotkeys
Open Whistle
Discovery
Popular tools & recently added
High-traffic calculators, bills, stamps and signatures — plus the latest additions across Nelstack.
Popular tools
- FinanceEMI CalculatorMonthly loan EMI, interest and repayment scheduleOpen
- BillsGST InvoiceRule 46–style tax invoice with CGST/SGST or IGSTOpen
- FinanceGold Rate TodayIndicative India gold prices in INR per gramOpen
- BillsRent ReceiptHRA claim-style rent receipts with landlord detailsOpen
- SignatureSign PDF OnlinePlace signatures and dates on a PDF in your browserOpen
- StampCreate StampDesign a company seal or status stampOpen
Recently added
- WhistleNewWhistle - Bookmark Launcher and ManagerChrome extension with aliases, fuzzy search and pinned hotkeysOpen
- FinanceNewOld Gold Exchange CalculatorEstimate old gold credit, making, GST and cash for new jewelleryOpen
- FinanceNewGoal SIP CalculatorReverse-calculate monthly SIP for any target corpusOpen
- FinanceNewInflation CalculatorFuture cost of today's expenses for goal planningOpen
- FinanceNewFinancial Goal PlannerPlan multiple goals with inflation-adjusted SIPOpen
- SignatureNewSign Documents OnlineSign Word and document files in the browserOpen
Workflows
Tools that work together
Move from one real Nelstack tool to the next — bills, signatures, stamps and calculators in a single flow.
Business document workflow
Create a bill, sign the PDF, design a seal, then stamp the document — all in the browser.
Personal finance workflow
Check rates, plan EMI, then compare the true cost of a loan.
HRA proof workflow
Estimate exemption, generate a rent receipt, and add a signature.
How we work
Simple rules, every product
Free to use
No accounts, paywalls or watermarks. Use any tool as often as you need.
Private by design
Bill, stamp and signature tools are built to process documents in your browser. See Privacy for contact forms and analytics.
Built for India
GST, HRA, Indian rates and everyday document formats people actually use.
Start anywhere
Need rates, a receipt or a signature?
Jump into a product — or read how we source rates and build calculators.